Now that all the christmas presents have been unwrapped, for many people it's time for the race to return. And hunt for clearance sales. Abc's linzie janis has the story. Reporter: Get ready for more hustle and bustle, as american goes returning. Taking back all those gifts that don't fit. Or you just don't want. We have seen a move towards return policies over the holidays. That's something that will help us out this week. Reporter: Before you go, retail experts say, take a few minutes and do your homework. A recent study ranked return policies. Among the most lenient, costco, nordstrom and walmart. The most restrictive, sears and best buy. And another thing to look for today, more of the megadiscounts. All you know, you're getting a very good deal because the week after christmas, retailers want to go through merchandise in order to transition to the next season's goods. Macy's after-christmas one-day sale thursday. With incredible door-busters. Reporter: Amazon.Com offering year-end deals of 70%, 60%, 50% off. Old navy's after-holiday deal, 75% off in store. The sales are so good because the pre-christmas shopping season has been so disappointing. My sense is they have too much inventory. We're seeing a lot of inventory-driven discounts right now. Reporter: Last week, in-store retail sales were down 3.1%. Foot traffic fell 21% since last year. Even the one bright spot, online shopping, expected to be up nearly 14% this year, is being soured. With u.P.S. Saying it expects to ship 15% more returns. So, I'm here at a best buy. The best buys across the country, open from 7:00 a.M. To 11:00 p.M. At night. They've extended that return WINDOW TO JANUARY 15th. Retailers everywhere, counting on us to work off our christmas calories with some power shopping. Lara? Linzie looks civilized. We're going to turn to a very merry royal christmas.

This transcript has been automatically generated and may not be 100% accurate.

20/20 12/20: Shopping Confidential

Holiday stories of shopping and survival.

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